contrast medium

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 [me´de-um] (pl. mediums, me´dia) (L.)
1. an agent by which something is accomplished or an impulse is transmitted.
3. a preparation used in treating histologic specimens.
contrast medium a radiopaque substance used in radiography to permit visualization of body structures. Called also contrast agent.
culture medium a substance or preparation used to support the growth of microorganisms or other cells; called also medium.
dioptric media refracting media.
disperse medium dispersive m.
dispersion medium dispersive m.
dispersive medium the continuous phase of a colloid system; the medium in which the particles of the disperse phase are distributed, corresponding to the solvent in a true solution.
refracting media the transparent tissues and fluid in the eye through which light rays pass and by which they are refracted and brought to a focus on the retina.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

con·trast me·di·um

any internally administered substance that has a different opacity from soft tissue on radiography or computed tomography; includes barium, used to opacify parts of the gastrointestinal tract; water-soluble iodinated compounds, used to opacify blood vessels or the genitourinary tract; may refer to air occurring naturally or introduced into the body; also, paramagnetic substances used in magnetic resonance imaging.
Farlex Partner Medical Dictionary © Farlex 2012

contrast medium

A substance, such as barium or air, used in radiography to increase the contrast of an image. A positive contrast medium absorbs x-rays more strongly than the tissue or structure being examined; a negative contrast medium, less strongly.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

contrast medium

Contrast, contrast agent Imaging A substance with a density–eg, a dye or signal differing from that of the organ or structure being imaged, which allows delineation of contour abnormalities; CMs that are more radiopaque–eg with barium or iodine—than the organ or structure being analyzed are known as positive CM, while those that are less radiopaque–eg, with air, are known as negative CM. See Radiopaque contrast.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

con·trast me·di·um

(kon'trast mē'dē-ŭm)
Any internally administered substance that has a different opacity from soft tissue on radiography or computed tomography; used to opacify parts of the gastrointestinal tract, blood vessels, or the genitourinary tract.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

contrast medium

Any substance offering greater resistance to the passage of X rays than soft tissues that can be introduced into a hollow organ so as to outline its interior during radiology. Contrast media include a suspension of a barium salt for the intestine (barium meal or enema) and iodine-containing fluids for the blood vessels and urinary tract.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

Contrast medium

A chemical substance used to make an organ or body part opaque on x ray.
Mentioned in: Hysterosonography
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

Patient discussion about contrast medium

Q. Has anyone had an allergic reaction to gadolinium dye, MRI contrast agents, I have had a severe reaction. I would like to know the long term effects of this dye. And if anyone else has had or heard of problems and reactions to it. Please answer me. Thank you

A. In 1969 I almost died from the IVP dye. I had no idea I was allergic and when I awoke I was in a "recovery room." The doctor told me to always tell any physicians/paramedics etc of my allergy status regarding the dye. I now have chronic back pain, have a history of cancer in the family and the doctor wants to do a scan (including dye) but when I emphasized that I was allergic he backed off. Now I am wondering if there is anything else that can be done to test the bone (scan) without the dye. Any answers? Thanks

More discussions about contrast medium
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References in periodicals archive ?
The caudocranial scan of LPBV started using bolus tracking technique when the attenuation of the main pulmonary trunk exceeded a threshold of 100 HU following the intravenous administration of low-os-molar nonionic iodinated contrast material (body weight <60 kg, 300 mgl/mL and body weight >60 kg, 350 mgl/mL, Omnipaque; Daiichi-Sankyo) via a 20-gauge catheter into the antecubital vein at a rate of 4 mL/s (100 mL of pure contrast medium followed by 30 mL of saline).
Nelemans et al., "Prophylactic hydration to protect renal function from intravascular iodinated contrast material in patients at high risk of contrast-induced nephropathy (AMACING): a prospective, randomised, phase 3, controlled, open-label, non-inferiority trial," The Lancet, vol.
Fistulography with the injection of the contrast material through the skin opening shows the connection to the uterus.
An aortic endoprosthesis was placed and a second CT scan was performed using oral hydrosoluble contrast material. Leakage of the contrast material to the posterior mediastinum, approximately 6 cm below the carina, was clearly seen (Figure 2).
The diagnosis is made with echocardiography with contrast material, computerized tomography and angiography.
The CTCA was performed with a dual source (2x64 detector system) CT scanner during free breathing and injection of 40 mL of intravenous contrast material. The average heart rate during the scan was 95 beats/min.
"We're beginning to move toward chromoendoscopy, where we spray the colon with a contrast material that picks up dysplasia a little bit better," he added.
The scans are done before, during, and after intravenous delivery of iodinated contrast material using a standard spiral CT scanner.
A small amount of contrast material will be injected through the catheter into your heart chamber or one of your coronary arteries.
The mass contained multiple calcific foci peripherally and did not enhance significantly following the administration of intravenous contrast material.
It may also involve invasive procedures associated with surgical risks of anesthesia, bleeding, infection, scarring, or it may entail additional radiological exams, associated with radiation risk and the potential risk of allergic reaction to injected contrast material. In any case, it is unlikely that CT screening will benefit an individual lacking signs or symptoms of disease by detecting a serious disease early enough to treat it and alter the outcome significantly.
Computed tomography enhanced with the use of contrast material also shows the course, caliber, and patency of the hepatic and portal circulation.